Compensation type neutron dose instrument

A neutron dose and neutron technology, which is applied in the field of neutron fluence rate measurement devices, can solve problems such as n-γ discrimination, and achieve the effects of improving neutron fluence response and reducing neutron fluence response.

Inactive Publication Date: 2013-02-13
三亚哈尔滨工程大学南海创新发展基地
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Problems solved by technology

In addition, plastic scintillator crystals are also used to measure neutron fluence rate. On the one hand, this type can only be used for fast neutron fluence measurement; There is an n-γ discrimination problem in rate measurement

Method used

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  • Compensation type neutron dose instrument
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Embodiment Construction

[0017] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0018] combine Figure 1~2 , the present invention includes a neutron fission value-added layer 2, a heavy metal layer 4 and a moderating sphere 6 between the packaging layer 1 and the counter 5, and the moderating sphere 6 has a certain number of air rods 3 along the radial direction. It is characterized in that the outer diameter of the probe ranges from 12 to 32 cm.

[0019] There is a heavy metal layer 4 on the outer layer of the counter 5, which refers to a metal with a high (n, xn) nuclear reaction cross section for high-energy neutrons, which is one of lead, copper, tungsten, tantalum, gold or platinum. The thickness of the heavy metal layer 4 is between 0.2-1.5 cm, and the preferred shape is a spherical shell.

[0020] The heavy metal layer 4 is preferentially made of lead material, which has a better ability to shield X and gamma rays.

[0021] The out...

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Abstract

The invention aims at providing a compensation type neutron dose instrument which comprises a packaging layer, a slowing-down sphere body and a heavy metal layer, wherein the slowing-down sphere body is arranged in the packaging layer, a neutron fission multiplication layer is arranged between the slowing-down sphere body and the packaging layer, the heavy metal layer is arranged in the slowing-down sphere body, a counter is arranged in the heavy metal layer, and an air rod is arranged in the slowing-down sphere body along a radial direction. According to the invention, neutron fluence response in a heat energy region can be improved, the neutron fluence response in an intermediate energy region can be correspondingly reduced, and accompanying Gamma rays in a neutron radiation field can be shielded.

Description

technical field [0001] The invention relates to a neutron flux rate measuring device in the fields of nuclear engineering and radiation protection. Background technique [0002] The measurement of neutron flux rate plays an important role in many fields of nuclear technology application; for example: nuclear reactor core power monitoring and core design parameter verification, measurement of nuclide neutron nuclear reaction cross section, and measurement of standard neutron radiation field parameters Wait. The current neutron fluence rate meter (measuring device) includes: long neutron counter, fission ionization chamber, multi-sphere spectrometer and plastic scintillator detector, etc. [0003] Most of the neutron fluence rate meters mentioned above adopt thermal neutron sensitive counters, such as BF 3 proportional counter, 3 He proportional counter and 6 Li glass detectors, etc., this type of counter satisfies the 1 / v law with the neutron reaction cross section. When ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/00
Inventor 李桃生杨国召颜强宫存溃刘琼瑶王庆宇彭帮保
Owner 三亚哈尔滨工程大学南海创新发展基地
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